Custom field models

GET /api/v1/options/custom-fields
GET /api/v1/options/custom-fields
curl \
 -X GET https://api.plannrcrm.com/api/v1/options/custom-fields \
 -H "Authorization: Bearer {OAUTH_ACCESS_TOKEN or PERSONAL_ACCESS_TOKEN}" \
 -H "Content-Type: application/json" \
 -H "Accept: application/json"